Réponse :
Explications étape par étape :
Bonsoir
A = - 14 + 54 / [3 * (21 + 9 × (-3)]
A = - 14 + 54 / [3 * (21 -27)]
A = - 14 + 54 / [3 * (- 6)]
A = - 14 + 54 / [- 18]
A = - 14 + (3 ×18)/ [- 18]
A = - 14 - 3
A = - 17
B = 5 × [ 8 × ( 12 + 4) + (-5) ]
B =5 × [ 8 × ( 16) + (-5) ]
B = 5 × [ 48 + (-5) ]
B = 5 × [ 48 - 5]
B = 5 × 43
B = 215